Last edited by Mazudal
Saturday, May 16, 2020 | History

3 edition of Crack growth direction in unidirectional off-axis graphite-epoxy found in the catalog.

Crack growth direction in unidirectional off-axis graphite-epoxy

Carl T. Herakovich

Crack growth direction in unidirectional off-axis graphite-epoxy

by Carl T. Herakovich

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Published by Virginia Polytechnic Institute and State University, Center for Composite Materials and Structures in Blacksburg, Va .
Written in English

    Subjects:
  • Composite materials.,
  • Fracture mechanics.

  • Edition Notes

    StatementC.T. Herakovich, M.A. Gregory, J.L. Beuth, Jr.
    SeriesNASA-CR -- 175752., Interim report / the NASA-Virginia Tech Composites Program -- 48., NASA contractor report -- NASA CR-175752., Interim report (NASA-Virginia Tech. Composites Program) -- 48.
    ContributionsGregory, M. A., Beuth, Jack L., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15276029M

    Wortels van het onbehagen: ecosofische beschouwingen. Deventer: Kluwer. MLA Citation. Beuth, Lodewijk S. Wortels van het onbehagen: ecosofische beschouwingen / Lod. S. Beuth Kluwer Deventer Australian/Harvard Citation. Beuth, Crack growth direction in unidirectional off-axis graphite-epoxy [microform] / C.T. Herakovich, M.A. Gre. "Dynamic Crack Initiation and Unstable Crack Growth in Unidirectional Graphite-Epoxy Composite Materials," Session on "Structural Properties of Advanced, Novel Composites," International Mechanical Engineering Congress and Exposition of the American Society of Mechanical Engineers (ASME-IMECE ), Orlando, FL, November ,

    displacement of off-axis unidirectional carbon fiber composites during fatigue crack growth for determining stress intensity factor ranges and determine if neglecting Mode II, which is common in literature, is a valid : Jacob L Biddlecom. An elastic analysis of an internal central crack with bridging fibers parallel to the free surface in an infinite orthotropic anisotropic elastic plane was analyzed, and the crack extension should occur in the format of self-similarity. When the fiber strength is over its maximum tensile stress, the fiber breaks. By means of complex variable functions, the problem considered can be easily Author: Yuntao Wang, Yunhong Cheng, Nianchun Lü, Jin Cheng.

    Unidirectional fiber-remforced composites exhibit a high degree of anisot ropy in strength. Crack initiation from a pre-existing crack almost always occurs along the fiber direction; it is known as Cited by: DAMAGE IN UNIDIRECTIONAL GRAPHITE/EPOXY LAMINATES CONTAINING A CIRCULAR HOLE Fan Yang and C. L. Chow Department of Mechanical Engineering University of Michigan-Dearborn Dearborn, Michigan nucleation and the growth of distributed microscopic cavities and cracksAuthor: Fan Yang, C.L. Chow, H. Eliot Fang.


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Crack growth direction in unidirectional off-axis graphite-epoxy by Carl T. Herakovich Download PDF EPUB FB2

Get this from a library. Crack growth direction in unidirectional off-axis graphite-epoxy. [Carl T Herakovich; M A Gregory; Jack L Beuth; United States.

National Aeronautics and Space Administration.]. Center-notched coupons of ply unidirectional AS4/ graphite-epoxy were loaded in tension to failure in order to determine the direction of initial crack growth, the load required to cause initial crack growth, and the load required to cause failure.

Fifteen-degree off-axis tensile coupons provided a far-field biaxial state of stress away from the by: 9. Abstract. An anisotropic elasticity crack tip stress analysis is implemented using three crack extension direction criteria (the normal stress ratio, the tensor polynominal and the strain energy density) to predict the direction of crack extension in unidirectional off axis graphite-epoxy.

An anisotropic elasticity crack tip stress analysis is implemented using three crack extension direction criteria (the normal stress ratio, the tensor polynominal and the strain energy density) to predict the direction of crack extension in unidirectional off axis graphite-epoxy.

The theoretical predictions of crack extension direction are then compared with experimental results for 15 deg off. PREDICTING CRACK GROWTH DIRECTION IN UNIDIRECTIONAL COMPOSITE LAMINAE F.

ELLYIN and H. El KADI Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G Abstracthe problem of predicting the direction of crack growth in a centre-notched uni- directional graphite-epoxy is by: The normal stress ratio theory is applied to predict crack extension behavior in center-notched unidirectional graphite-epoxy of arbitrary fiber axis orientation, subjected to arbitrary far-field.

ing on the direction of crack growth in unidirectional off-axis compos-ite materials were investigated. Specific emphasis was placed on defin-ing the crack tip stress field and finding a consistent criterion for predicting the direction of crack growth. Two models are presented to predict the crack.

Thus the direction of crack extension ~b = 4), is obtained from dW a2W =0 and _-: =-= CRACK GROWTH DIRECTION For off-axis unidirectional tensile coupons and for unidirectional laminae subjected to mixed-mode loading, the results obtained using the critical strain energy criterion were reported in ref.

[4] and the Cited by: 2. Notched specimens of multi-layered unidirectional graphite/epoxy were loaded m tension to determine the direction of initial crack growth and the load required to cause initial crack growth.

Also, a parametric study to o p t m e the stacking sequence to control the crack propagation is : K.M. Elawadly, M. El-Sayed. An anisotropic crack tip stress analysis was implemented using three criteria (the normal stress ratio theory, the tensor polynominal failure criterion and the strain energy density theory) to predict the direction of crack extension in unidirectional off- axis by: The purpose of this study is to gain a better understanding of the parameters affecting crack growth direction in unidirectional composite materials.

To achieve this, the effect of anisotropy and biaxial, far field, loading on the direction of crack growth in unidirectional off-axis composite materials is investigated. Specific emphasis is placed on defining the crack-tip-stress field and.

Recent experiments on dynamic fracture of unidirectional fiber-reinforced graphite/epoxy composite materials showed that, in Mode I, the crack tip velocity could never exceed the shear wave speed.

Fatigue of composite materials. crack growth fatigue damage fatigue loading fatigue model fatigue theories fiber fracture fracture mechanics fracture toughness function graphite epoxy laminate initial injection-molded interface interlaminar K.L.

Reifsnider linear material systems matrix cracks metal matrix composites moisture notch number. To prevent damage to graphite/epoxy parts in space, LEO exposed composites need protective coatings which are non-reactive with atomic oxy­ gen The Space Station, for example, will require aluminum foil, probably 4 to 5 mils, over the graphite/epoxy struts used in the connecting by: 1.

anisotropic materials with cracks and, (ii) graphical simulation of crack growth in unidirectional composites.

Lekhnitskii’s stress function method is used to formulate the traction-free crack bound-ary value problem with the stress function expressed in a Laurent series. The geometry ofthe element is. Controlled crack growth specimen for brittle systems [microform] / Anthony M. Calomino and David N.

Brewer; Stress intensity and crack displacement for small edge cracks [microform] / Thomas W. Orange; Crack growth direction in unidirectional off-axis graphite-epoxy [microform] /. The unidirectional glass fiber-reinforced epoxy which composed of ten plies was used in this test; the total thickness of the laminate is 2 mm.

Unidirectional tensile specimens were cut out of the laminates in both fiber and matrix directions (longitudinal and Woven glass/epoxy tabs Cited by:   The selection also explains the curved thermal crack growth in the interface of a unidirectional carbon-aluminum composite and energy release rates of various microcracks in short-fiber composites.

The book will be of great interest to researchers and professionals whose line of work requires the understanding of the mechanics of composite Book Edition: 1. Crack Growth Direction in Unidirectional Off-Axis Graphite-Epoxy C.

Herakovichl M. Gregory2 J. Beuth, Jr.3 Department of Engineering Science & Mechanics Interim Report 48 The NASA-Virginia Tech Composites Program NASA Cooperative Agreement NAG Prepared for: Applied Materials Branch and Hercules, Inc.

National Aeronautics Bacchus. The fatigue properties of graphite/epoxy (Gr/Ep) T/ composite laminates of 16 plies with a central circular hole subjected to tension-tension (T-T) constant-stress amplitudes at room temperature and low humidity have been fully investigated.

Studied are four types of notched laminates which are classified as unidirectional, off-axis, orthotropic shear and by: 9. Off-axis static and fatigue behavior of AS/A graphite/epoxy was studied in an effort to characterize the matrix/interface-controlled failure.

Seven different off-axis angles were tested: 0, 10, 20, 30, 45, 60, and 90 deg. Initial (static) and post-fatigue residual strength were Cited by: For unidirectional laminates with off-axis loading angles between 0 0 and 90 0, fibres and causes an opening mode and the other parallel to the fibres and causes sliding mode of crack growth.

For angle to the loading direction. Cross-ply cracks are also formed if stresses in the direction [email protected]{osti_, title = {Mixed-Mode and Mode-II Fatigue Crack Growth in Woven Composites}, author = {Fenner, Joel S. and Daniel, Isaac M.}, abstractNote = {In this work, a woven carbon/epoxy composite was subjected to fatigue crack growth under mixed Mode-I/Mode-II loading to obtain crack growth behavior at different cyclic strain energies.